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在离散元框架中对粘结锚进行建模

Modeling Adhesive Anchors in a Discrete Element Framework.

作者信息

Marcon Marco, Vorel Jan, Ninčević Krešimir, Wan-Wendner Roman

机构信息

Christian Doppler Laboratory LiCRoFast, Department of Civil Engineering and Natural Hazards, University of Natural Resources and Life Sciences (BOKU), 1190 Vienna, Austria.

Department of Mechanics, Faculty of Civil Engineering, Czech Technical University in Prague, 16629 Prague, Czech Republic.

出版信息

Materials (Basel). 2017 Aug 8;10(8):917. doi: 10.3390/ma10080917.

DOI:10.3390/ma10080917
PMID:28786964
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5578283/
Abstract

In recent years, post-installed anchors are widely used to connect structural members and to fix appliances to load-bearing elements. A bonded anchor typically denotes a threaded bar placed into a borehole filled with adhesive mortar. The high complexity of the problem, owing to the multiple materials and failure mechanisms involved, requires a numerical support for the experimental investigation. A reliable model able to reproduce a system's short-term behavior is needed before the development of a more complex framework for the subsequent investigation of the lifetime of fasteners subjected to various deterioration processes can commence. The focus of this contribution is the development and validation of such a model for bonded anchors under pure tension load. Compression, modulus, fracture and splitting tests are performed on standard concrete specimens. These serve for the calibration and validation of the concrete constitutive model. The behavior of the adhesive mortar layer is modeled with a stress-slip law, calibrated on a set of confined pull-out tests. The model validation is performed on tests with different configurations comparing load-displacement curves, crack patterns and concrete cone shapes. A model sensitivity analysis and the evaluation of the bond stress and slippage along the anchor complete the study.

摘要

近年来，后置锚栓被广泛用于连接结构构件以及将器具固定到承重构件上。粘结型锚栓通常指的是放置在填充有粘结砂浆的钻孔中的螺纹杆。由于涉及多种材料和破坏机制，该问题具有高度复杂性，需要数值方法来辅助实验研究。在开发更复杂的框架以随后研究承受各种劣化过程的紧固件的寿命之前，需要一个能够再现系统短期行为的可靠模型。本文的重点是开发和验证这种在纯拉伸载荷下粘结型锚栓的模型。对标准混凝土试件进行压缩、模量、断裂和劈裂试验。这些试验用于混凝土本构模型的校准和验证。粘结砂浆层的行为采用应力-滑移定律进行建模，并通过一组约束拉拔试验进行校准。通过比较不同配置试验的荷载-位移曲线、裂缝模式和混凝土锥体形状来进行模型验证。模型敏感性分析以及对沿锚栓的粘结应力和滑移的评估完成了这项研究。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9893/5578283/ec2f37ca3e7b/materials-10-00917-g015.jpg
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